JP5279052B2 - Video display system, adapter and video display device - Google Patents

Description

  The present invention relates to an adapter connected between a video display device and another device, and a video display system including the adapter and the video display device.

  Video display devices such as projectors and large display devices have been handled as shared facilities in a plurality of departments in company offices and the like. Currently, video display devices are used not only in limited places such as offices, but also in places with many people such as schools and auditoriums. For this reason, management of video display devices has become more important, and the need for security to prevent unauthorized use of video display devices has increased.

  An example of a projector that does not display an image unless a predetermined password is input is disclosed in Japanese Patent Laid-Open No. 2008-90285.

  If the use of the projector is managed with a password, the projector user must remember the password. Further, it is necessary to input a password on the projector on-screen display (OSD) by operating the remote control. If the remote control is not designed in consideration of password input, the password input operation is troublesome for the user. . Password management and input were burdensome for users.

  For this reason, even if the projector has a password security function, the projector is not frequently used, does not function as security, and can be used without permission by a person other than a regular user.

  One object of the present invention is to provide a video display system and an adapter that can reduce the burden on the user and prevent unauthorized use of the video display device.

The video display system according to one aspect of the present invention includes a first memory in which a predetermined code is registered in advance, and determines whether or not to activate a function for displaying a video based on a video signal received from the video output device. a control unit for controlling, connected with the image display device, and each of the video output apparatus and a video display device, a second memory in which the code corresponding to the image display apparatus has been registered in advance, the security from the video output device Upon receiving the setting request signal, the adapter including a microcomputer for transmitting the code registered in the second memory to the video display device, the possess a code registered in the first memory, the second memory The registered code is different for each combination of the video display device and the adapter, and the control unit receives the code registered in the second memory from the adapter. It is determined whether or not the two codes of the received code and the code registered in the first memory match. When the two codes match, a function for displaying an image is activated and the two codes are activated. If they do not match, the function for displaying the video is not activated .

An adapter according to an aspect of the present invention includes a signal line connected to each of a video output device for outputting a video signal and a video display device for receiving a video signal, and a video display device for displaying video. used function to determine whether or not to start, a second memory code corresponding to the image display device is registered in advance, when receiving via the signal line security setting request signal from the video output apparatus, the second And a microcomputer that transmits a code registered in the memory to the video display device via a signal line.

FIG. 1 is a diagram for explaining a video display system of the present embodiment. FIG. 2 is a block diagram showing a configuration example of the PC shown in FIG. FIG. 3 is a block diagram showing a configuration example of the projector shown in FIG. FIG. 4 is a block diagram showing a configuration example of the adapter shown in FIG. FIG. 5 is a sequence diagram showing a procedure for changing the security setting of the projector from OFF to ON. FIG. 6 is a flowchart showing an operation procedure for starting up the projector whose security is set to ON. FIG. 7 is a sequence diagram showing a procedure for changing the projector security setting from on to off.

Explanation of symbols

10 Adapter 12, 13 Cable 103 Microcomputer 105 Projector

  The video display system of this embodiment will be described. FIG. 1 is a diagram for explaining a video display system of the present embodiment. In this embodiment, it is assumed that the video display device is a projector.

  The video display system according to the present embodiment includes a projector 105 and an adapter 10. As shown in FIG. 1, the adapter 10 is connected to a personal computer (hereinafter referred to as a PC) 107 and a projector 105. The adapter 10 includes cables 12 and 13, is connected to the PC 107 via the cable 12, and is connected to the projector 105 via the cable 13. The PC 107 is an example of a video output device for supplying a video signal to the projector 105.

  FIG. 2 is a block diagram showing a configuration example of the PC shown in FIG.

  As illustrated in FIG. 2, the PC 107 includes a storage unit 171, a display unit 172, a control unit 173, an operation unit 174, and a connector unit 175. The connector portion 175 is connected to the adapter 10 via the cable 12 shown in FIG. The control unit 173 includes a CPU (Central Processing Unit) 181 that executes processing according to a program, and a memory 182 that stores the program. The memory 182 is a nonvolatile memory.

  When the control unit 173 receives a message from the adapter 10 asking whether to set or cancel the security of the projector, the control unit 173 displays the message on the display unit 172. When an instruction for setting security is input via the operation unit 174, the control unit 173 transmits a security setting request signal, which is a control signal for requesting to set security to ON, to the adapter 10. . On the other hand, when an instruction to release security is input via the operation unit 174, the control unit 173 sends a security release request signal, which is a control signal for requesting that security is turned off, to the adapter. 10 to send.

  Next, the configuration of the projector 105 will be described. FIG. 3 is a block diagram showing a configuration example of the projector shown in FIG.

  As illustrated in FIG. 3, the projector 105 includes a video display unit 152, a video signal processing unit 151, a control unit 153, an operation unit 154, and a connector unit 155. The connector part 155 is connected to the adapter 10 via the cable 13 shown in FIG. The control unit 153 includes a CPU 161 that executes processing according to a program, and a memory 162 that stores the program.

  The memory 162 is a nonvolatile memory. In the memory 162, in addition to the program, different codes for each combination of the projector 105 and the adapter 10 are registered in advance. An example of a combination of the projector 105 and the adapter 10 is a case where the adapter 10 is attached as an accessory when the projector 105 is purchased. Also, in the memory 162, security setting information indicating whether the projector security is set to on or off is registered. The security setting information corresponds to information on whether to set or cancel unauthorized use prevention.

  The video signal processing unit 151 performs signal discrimination such as a horizontal frequency, a vertical frequency, and a resolution on the video signal input via the connector unit 155. The video signal processing unit 151 performs image processing such as conversion to a resolution that can be displayed on the video display unit 152 and image quality processing on the video signal, and outputs the video data after the image processing to the video display unit 152. To do.

  The video display unit 152 includes a light valve (not shown) that forms a video from the video data input from the video signal processing unit 151, a light source (not shown) that projects the video formed by the light valve onto a screen, and A plurality of lenses (not shown) and a focus adjustment unit (not shown) for moving the lenses along the optical axis are provided.

  The operation unit 154 is provided with a power switch for turning on / off the projector 105 and a plurality of control buttons for projecting an image based on a video signal input from the outside onto the screen. A remote controller is also included in the operation unit 154.

  The control unit 153 manages security setting information registered in the memory 162. When receiving the code from the adapter 10, the control unit 153 determines whether or not the received code matches the code registered in the memory 162. When these two codes match, the control unit 153 activates the video signal processing unit 151. At that time, if the security setting information is not registered or the security setting information is set to off, the control unit 153 sets the security setting information to on. Thereby, prevention of unauthorized use is set. Note that if the two codes do not match, the control unit 153 does nothing.

  If the security setting information registered in the memory 162 is set to ON, the control unit 153 does not activate the video signal processing unit 151 unless the code is received from the adapter 10, and the user cannot use the projector 105.

  When the controller 153 receives a security release signal including information indicating that security is turned off and code information from the adapter 10, the control unit 153 sets the security setting information to off and cancels unauthorized use prevention. When the security setting information registered in the memory 162 is set to OFF, the user can freely use the projector 105 even if the adapter 10 is not connected or no code is received from the adapter 10. Is possible.

  In the present embodiment, the case where the code is different for each combination of the projector and the adapter will be described. However, one type of code may be used.

  Next, the configuration of the adapter 10 will be described. FIG. 4 is a block diagram showing a configuration example of the adapter shown in FIG.

  As shown in FIG. 4, the adapter 10 includes a microcomputer (hereinafter referred to as a microcomputer) 103 and cables 12 and 13. The standards of the connector portions (not shown) of the cables 12 and 13, the connector portion 175 of the PC 107, and the connector portion 155 of the projector 105 are unified. In this embodiment, the connector standard is 9-pin D-Sub.

  The control signal line 114 shown in FIG. 4 is a signal line for transmitting and receiving control signals between the microcomputer 103 and the PC 107, and the control signal line 115 is for transmitting and receiving control signals between the microcomputer 103 and the projector 105. This is a signal line.

  The adapter 10 is provided with a power line 113 for supplying power to the microcomputer 103. In the present embodiment, the power line 113 is connected to the PC 107, and the microcomputer 103 receives power supply from the PC 107. As the microcomputer 103, for example, a microcomputer whose power consumption is low enough to operate with the power supply voltage 5V supplied from the PC 107 is used.

  The cable 12 and the cable 13 are provided with a control signal line 111 and a video signal line 112 that relay the adapter 10. The control signal line 111 is a signal line for directly transmitting / receiving a control signal between the PC 107 and the projector 105 after the projector 105 becomes usable. The video signal line 112 is a signal line for transmitting a video signal directly from the PC 107 to the projector 105 after the projector 105 becomes usable.

  The configuration of the microcomputer 103 of the present embodiment is an IC (Integrated Circuit) chip. The microcomputer 103 includes a CPU 121 that executes processing according to a program, and a memory 122 that stores the program. The memory 122 is a nonvolatile memory. In the memory 122, codes corresponding to the projectors 105 of the same combination are registered in advance.

  When the microcomputer 103 starts receiving power supply from the PC 107, the microcomputer 103 transmits a message to the PC 107 asking whether to set or cancel the security of the projector. When the microcomputer 103 receives the security setting request signal from the PC 107, the microcomputer 103 reads the code from the memory 122 and transmits it to the projector 105. In addition, when the microcomputer 103 receives the security release request signal from the PC 107, the microcomputer 103 transmits the security release signal to the projector 105.

  Next, procedures of various operations in the video display system of this embodiment will be described.

  First, a procedure for changing the security setting of the projector 105 from off to on will be described. FIG. 5 is a sequence diagram showing a procedure for changing the security setting of the projector from OFF to ON.

  As shown in FIG. 1, the user connects the cable 12 of the adapter 10 to the PC 107 and connects the cable 13 to the projector 105. Subsequently, the user turns on the projector 105 and the PC 107. As a result, the PC 107 and the projector 105 are activated.

  When power is supplied from the PC 107 to the adapter 10, the microcomputer 103 transmits a message to the PC 107 inquiring whether to turn security on or off (step 101). The PC 107 displays the message received from the microcomputer 103 on the display unit 172 (step 102). When the user operates the operation unit 174 to input an instruction to set security on, the PC 107 transmits a security setting request signal to the adapter 10 via the cable 12 (step 103).

  When receiving the security setting request signal from the PC 107, the microcomputer 103 reads the code from the memory 122 and transmits the read code to the projector 105 via the cable 13 (step 104). When receiving the code from the adapter 10, the control unit 153 of the projector 105 determines whether the received code matches the code registered in the memory 162 (step 105).

  If the control unit 153 determines that the two codes match as a result of the determination, the control unit 153 changes the security setting information in the memory 162 from off to on (step 106). On the other hand, if the two codes do not match in the determination in step 105, the control unit 153 does not update the security setting information in the memory 162 and leaves it as it is.

  Here, when the PC 107 is turned on, the projector 105 is also turned on, but the projector 105 may be turned on later. In this case, the microcomputer 103 transmits the code to the projector 105 at regular intervals. The control unit 153 of the projector 105 can receive the code from the adapter 10 after the power of the projector 105 is turned on and the power supply is started.

  Next, a procedure for starting up a projector whose security is set to ON in advance will be described.

  FIG. 6 is a flowchart showing an operation procedure for starting up the projector whose security is set to ON.

  As shown in FIG. 1, the user connects the cable 12 of the adapter 10 to the PC 107 and connects the cable 13 to the projector 105. Subsequently, the user turns on the projector 105 and the PC 107. At this time, the PC 107 is activated, but since the security of the projector 105 is set to ON, the control unit 153 does not activate the video signal processing unit 151.

  When power is supplied from the PC 107 to the adapter 10, the same processing as Step 101 to Step 104 described in FIG. 5 is performed (Steps 201 to 204). When receiving the code from the adapter 10, the control unit 153 of the projector 105 determines whether or not the received code matches the code registered in the memory 162 (step 205).

  If the control unit 153 determines that the two codes match as a result of the determination, the control unit 153 starts power supply to the video signal processing unit 151 and activates the video signal processing unit 151 (step 206). When the video signal processing unit 151 is activated, the user can use the projector 105.

  On the other hand, if the two codes do not match in the determination in step 205, the control unit 153 does not activate the video signal processing unit 151. Since the video signal processing unit 151 is not activated, the user cannot use the projector 105.

  Although the projector 105 is also turned on when the PC 107 is turned on, the projector 105 may be turned on later. In this case, the microcomputer 103 transmits a code to the projector 105 at regular intervals.

  Next, a procedure for changing the security setting of the projector 105 from on to off will be described. FIG. 7 is a sequence diagram showing a procedure for changing the projector security setting from on to off.

  As shown in FIG. 1, the user connects the cable 12 of the adapter 10 to the PC 107 and connects the cable 13 to the projector 105. Subsequently, the user turns on the projector 105 and the PC 107. At this time, the PC 107 is activated, but since the security of the projector 105 is set to ON, the control unit 153 does not activate the video signal processing unit 151.

  When power is supplied from the PC 107 to the adapter 10, processing similar to that from step 101 to step 102 described in FIG. 5 is performed (steps 301 to 302). Subsequently, when the user operates the operation unit 174 to input an instruction to set security off, the PC 107 transmits a security release request signal to the adapter 10 via the cable 12 (step 303).

  When receiving the security release request signal from the PC 107, the microcomputer 103 reads the code from the memory 122 and transmits the security release signal to the projector 105 via the cable 13 (step 104).

  When receiving the security release signal from the adapter 10, the control unit 153 of the projector 105 determines whether the code included in the security release signal matches the code registered in advance in the memory 162 (step 305). If the control unit 153 determines that the two codes match as a result of the determination, the control unit 153 changes the security setting information in the memory 162 from on to off (step 106). Subsequently, the control unit 153 starts power supply to the video signal processing unit 151 and activates the video signal processing unit 151. On the other hand, if the two codes do not match in the determination in step 305, the control unit 153 does not update the security setting information in the memory 162 and leaves it as it is.

  With the method described above, it is not possible to cancel the security of the projector 105 using the adapter 10 having a different code. Therefore, even if a person who does not have the adapter 10 of the same combination as the projector 105 tries to release the security of the projector 105, the projector 105 cannot be released and unauthorized use of the projector 105 can be prevented. If the security of the projector 105 is canceled, a user other than the projector administrator can freely use the projector 105 without the adapter 10.

  In this embodiment, the case where the code is different for each combination of the projector and the adapter has been described. However, there is only one type of code, and any combination may be the same. In this embodiment, the code plays two roles as information and an identifier that instructs the projector to start, but when there is only one type of code, the code indicates a signal that instructs the projector to start. Play a role.

  When there is only one type of code, the determination processing in step 105 shown in FIG. 5, step 205 shown in FIG. 6, and step 305 shown in FIG. 7 is omitted. In the case of FIG. 6, when the projector 105 receives a code from the adapter 10 in step 204, the projector 105 activates the video signal processing unit 151 to make the projector 105 usable.

  As described above, in the present embodiment, if the security of the projector is set to ON, the projector cannot be used without an adapter, so that unauthorized use of the projector can be prevented. The user may store the adapter separately from the projector so that the adapter is not used illegally. An adapter mainly composed of one microcomputer is more compact than a projector, and storing the adapter places less burden on the user than storing the projector. Further, since the user does not need to memorize the password, the burden on the user is reduced.

  In addition, as described in the present embodiment, if the code is different for each combination of projector and adapter, not only can the projector not be used with an adapter with a different combination, but also the security settings cannot be changed, which is illegal. The prevention effect against use is improved.

  Further, since power is supplied from the PC to the adapter microcomputer, there is no need to mount a power source on the adapter, and the adapter can be made more compact. If the microcomputer is an integrated circuit, the adapter can be made more compact.

  In the present embodiment, the control unit 153 of the projector 105 controls the power supply to the video signal processing unit 151 corresponding to the security setting, but the video display unit 152 instead of the video signal processing unit 151. May be controlled. The function for displaying the video to be controlled is not limited to the video signal processing unit 151 and the video display unit 152, but may be other configurations such as a lamp power source.

  Moreover, although the case where the power supply to the microcomputer is performed from the PC side has been described, the power supply to the microcomputer may be performed from the projector side.

  The present invention is not limited to use in a company office, but can be applied to prevent unauthorized use of a video display device when used in an educational field such as a school or an auditorium, and when it is portable. is there.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

Claims (8)

A video display device including a first memory in which a predetermined code is registered in advance , and including a control unit that controls whether or not to activate a function for displaying video based on a video signal received from the video output device; ,
Which is connected to each of the video output device and the image display device, a second memory the code corresponding to the image display device is registered in advance, upon receiving the security setting request signal from the video output apparatus, the An adapter including a microcomputer for transmitting the code registered in a second memory to the video display device;
I have a,
The code registered in the first memory and the code registered in the second memory are different for each combination of the video display device and the adapter,
When the control unit receives the code registered in the second memory from the adapter, whether or not two codes of the received code and the code registered in the first memory coincide with each other When the two codes match, the video display system activates the function for displaying the video, and when the two codes do not match, the video display system does not activate the function for displaying the video. Before Symbol control unit,
And managing security setting information registered in the first memory and indicating that security is set to on or off,
When the security registered in the first memory is set to ON, when the code registered in the second memory is received from the adapter, it is determined whether or not the two codes match When the two codes match, the function for displaying the video is activated, and when the two codes do not match, the function for displaying the video is not activated.
If the security registered in the first memory is set to off, whether or not to activate the function for displaying the video regardless of the code registered in the second memory Control,
The video display system according to claim 1 . The controller is
When receiving the code registered in the second memory from the adapter, it is determined whether the two codes match,
If the two codes match, if the security setting information is not registered in the first memory, the security setting information is set to ON and registered in the first memory, or the security setting If the information is set to off and registered in the first memory, the registered security setting information is set to on and updated,
If the two codes do not match, the security setting information is not registered or updated.
The video display system according to claim 2 . The microcomputer is
Upon receiving the security release request signal from the previous SL video output device, it transmits a release signal including information indicating to set off the code and security registered in the second memory to the video display device,
The controller is
When receiving the release signal from the adapter, it is determined whether the two codes of the code registered in the code and the first memory included in the release signal matches,
If the two codes match, if the security setting information is registered in the first memory, the registered security setting information is set to off and updated,
If the two codes do not match, the security setting information registered in the first memory is not updated.
The video display system according to claim 2 or 3 . 5. The microcomputer according to claim 1 , wherein, when transmitting the code registered in the second memory to the video display device, the microcomputer transmits the code to the video display device at regular intervals. The video display system described in the section. The video display system according to claim 1 , wherein the adapter is further provided with a power line for receiving power supply from the video output device or the video display device. A signal line connected to each of a video output device that outputs a video signal and a video display device that receives the video signal;
A second memory that is used to determine whether or not to activate a function for displaying a video in the video display device, and a code corresponding to the video display device is registered in advance;
When the security setting request signal from the previous SL video output device receives, via the signal line, and a microcomputer for transmitting the code registered in said second memory to said image display device via the signal line,
Having an adapter. A video display device connected to an adapter for transmitting a code including information indicating that a function for displaying a video by an externally input video signal is activated,
A control unit for controlling whether to activate a function for displaying the video, including a first memory in which a code corresponding to the device itself is registered in advance;
When the control unit receives the code transmitted from the adapter, the control unit determines whether or not two codes of the received code and the code registered in the first memory match, and the 2 A video display device that activates a function for displaying the video when two codes match, and does not activate a function for displaying the video when the two codes do not match.

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